Previously, Download Youtube Videos, Online videos as DivX, avi has only ways to download Youtube videos in Standard Quality. Now, Youtube.com has a lot of High Quality videos and you can’t normally download the high quality version.
KeepHD is a online web app that lets you download HD videos from Youtube. Not only can you download HD copies of your movies, you can also download the mobile 3GP version for your mobile devices plus the standard MP4 and FLV format. Just enter your Youtube video URL below, and KeepHD will automatically grab each version of the video you want to download.
Remember, In order for you to download your Youtube video in 720p HD, your video must meet Youtube’s requirements listed here.